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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_SHARED_STORAGE_SHARED_STORAGE_SAVED_QUERY_DATA_H_
#define CONTENT_BROWSER_SHARED_STORAGE_SHARED_STORAGE_SAVED_QUERY_DATA_H_
#include <stdint.h>
#include <queue>
#include "base/functional/callback.h"
#include "content/common/content_export.h"
namespace content {
// Bundles `index`, which is either -1 (indicates that the query's result is
// still pending) or a nonnegative integer value denoting the saved index
// result, along with `callbacks` (if any) to be run when a pending query result
// is resolved.
struct CONTENT_EXPORT SharedStorageSavedQueryData {
SharedStorageSavedQueryData();
explicit SharedStorageSavedQueryData(uint32_t index);
SharedStorageSavedQueryData(const SharedStorageSavedQueryData&) = delete;
SharedStorageSavedQueryData(SharedStorageSavedQueryData&& other);
~SharedStorageSavedQueryData();
SharedStorageSavedQueryData operator=(const SharedStorageSavedQueryData&) =
delete;
SharedStorageSavedQueryData& operator=(SharedStorageSavedQueryData&& other);
// `index` is either -1 (denotes that the result is pending) or a nonnegative
// integer denoting the actual index result value.
int32_t index;
// In the case where the `index` is pending, callbacks are pushed to
// `callbacks` each time, excluding during the initial access, that the
// pending result is accessed while it is still in a pending state. When the
// result is resolved, these `callbacks` will be dequeued and run.
std::queue<base::OnceCallback<void(uint32_t)>> callbacks;
};
} // namespace content
#endif // CONTENT_BROWSER_SHARED_STORAGE_SHARED_STORAGE_SAVED_QUERY_DATA_H_
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